Ternus illusion

Ternus illusion

The Ternus illusion is an illusion of human visual perception involving apparent motion. In one form of the illusion, two dots (let's call them L for left and C for centre) are shown side by side as the first frame of a movie, then two similar dots (let's call them C for centre and R for right) are shown on the second frame. Depending on various factors including the time between the first and second frames, people see either element motion, in which L appears to move to R while C remains stationary, or group motion, in which L and C appear to move together to C and R.

External links

* [http://www.owlnet.rice.edu/~psyc351/Images/TernusAM3.gifElement motion]
* [http://www.owlnet.rice.edu/~psyc351/Images/TernusAM4.gifGroup motion]


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